Stroller handlebar



FIG. 1 is a perspective view of a stroller handlebar, the broken lines showing only the environment, which forms no part of the claimed design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof; and,

FIG. 6 is a top view thereof. 

The ornamental design of the stroller handlebar, as shown and described. 